conf.smtp-no-username-or-password.yml

global:
  smtp_smarthost: 'localhost:25'
  smtp_from: 'alertmanager@example.org'
  smtp_hello: "host.example.org"
route:
  receiver: 'email-notifications'
receivers:
  - name: 'email-notifications'
    email_configs:
      - to: 'one@example.org'